Ellipsograph.



L. BURKE.

v ELLIPSOGRAPH.

APPLICATION FILED MAR.7, 1911. l

- 1,026,5 Patented May14, 1912.

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"o, WITNESSES lIIIl IIVVEIVTOR,

42% v l flow Burke ATTORNEY L BURKE. I I ELLIPSOGRAPH.

APPLICATION FILED MAR. 7, 1911.

Patented May 14, 1912.

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llVVE/VTOR 1 Low/ Eurke By Ma LOUIS BURKE, OF- NEW YORK, N. Y.

ELLIPSOGRALPH.

Specification of Letters Patent.

Patented May 14, 1912.

Application filed March 7, 1911. Serial No. 612,737.

To all whom it may concern:

,Be it known that I, LOUIS BURKE, a subject of the Czar of Russia,residing at New York, in the county of New York and State of New York,have invented new and useful Improvements in Ellipsographs, of which thefollowing is a specification.

This invention relates to ellipsographs and it consists of a devicereadily adjustable for ellipses of different sizes and quickly operatedto draw ovals and ellipses as will be more fully described in thefollowing specification, set forth in the claims and illustrated in thedrawings, wherein,

Figure 1 is an elevation of the device partly in section. Fig. 2 is aplan view. Fig. 3 is a horizontal sectional view of the adjustinggearing. Fig.4is aplan view of the pencil adjuster. Fig. isa sectionalview taken on line 5- 5 of Fig. 1 showing the mounting of the form disk.Fig. 6 is a sectional view of the pencil adjuster, approximately on line6-6 of Fig. 4. Fig. 7 is a side elevation of the operating frame showing a modified construction. Fig. 8 is a detail sectional view. Fig. 9is a cross sectional View of the pencil holder. Fig. 10 is a view of acentering pin.

The device is mounted on a circular frame having a base 16 of rubber orsimilar frictional material and at one side an upright 17 with an arm 18carrying a shaft 19 which is reduced at its upper end and locked withinthe head 20 by means of the lock nuts 21 and 22. This shaft 19 extendsdownward and is pointed to designate the center of the circle or ellipseto be drawn. The shaft 19 is provided with sleeves 23 and 24 and to theformer is secured a block 25 while the latter also has a block 26, bothof which are provided with threaded perfora tions in which play thescrews 27 and 28 threaded in opposite directions and having at theirlower ends pinions 29 and 30.

Interposed between the two pinions 29 and 30 is a pinion 31 carried by asleeve 32 having on its lower end a thumb wheel 33, the rotation ofwhich causes the screws 27 and 28 to rotate in opposite directions andcarries the blocks 25 and 26 up and down on the shaft 19.

As will be seen in Fig. 5, the blocks 25 and 26 are provided withhorizontal portions whose outer ends carry rods 34 which are j ournaledin boxes 35 on a disk 36. This disk 36 is preferably provided with aring 37 having a sharp outer edge 38, the disk and the ring beingsecured together by means of screws 39.

The above described mechanism is adapted to shift the disk 36 so as tothrow it at an angle, a plan of which is an oval whose shorter diameteris regulated by the inclination of the disk.

lVithin the frame 15 is a ring 40 with gear teeth in its outer edge andadapted to slide around the frame. Meshing with the teeth of the ring isa pinion 41 on a shaft 42 which is rotated by means of the gear wheels43 and 44, the latter being provided with a crank arm 45. Connected withthe ring 40 is a post 46 having at its upper end the horizontal rod 47,through which the shaft 19 passes, the rod being provided with a block48 at that point. The upper end of the shaft 19 is also encircled by ablock 4-9 carrying the horizontal rod 50. Both of these rods carrysleeves 51 and 52 connected by uprights 53 and 54- and which comprise aframe having levers 55 at each side and which are pivoted at a point online with the disk 36 when it occupies a horizontal position. The sleeve52 is slotted and through the slot passes the pivot 56 of a lever 57having at its upper end the tension spring 58 while its lower end playsagainst a pin 58? carried by the upright 54 so that the frame is pushedforward causing the upright 54 to bear on the edge 37 of the disk.

In order to strengthen the rods 47 and they are connected by means ofthe bar 59, and the lever is pivoted to an arm 60 by means of a slottedconnection 61 while its lower edge is also slotted at 62 and throughthis slot plays a pin 63 carried by the pencil holder 64. The pencilholder is best shown in Figs. 4, 6 and 9 where it will be seen that twoguide-ways 65 are provided for a sliding frame 66, carrying an adjustingscrew 67 which is operated by the gear wheels 68 and 69. Guide ways 65comprise spaced parallel bars formed integrally with the ring 40 each ofwhich have their inner surfaces formed to provide grooves adapted toslidably support the frame 66. On the adjusting screw 67 is a verticalpencil carrier 70 which slides in the frame 66, the carrier being hollowand carrying the lead 71 which is pressed downward by means of a spring72. The downward movement of the pencil is limited by means of a pin 73which presses against the stop 74: which may be adjusted by means of thescrews 7 5 to any desired height.

The modified form shown in Fig. 7 consists of a frame 7 6 playing on theflat edge of a disk 78 and having the usual lever for operating thepencil and the lever 57 for producing a pressure on the frame. The frame76 slides in guide-ways 79 and the usual tension spring 58 is provided.

In order to properly locate the device, adjustable pins 80 are providedto mark its location on the paper or board where it would be otherwisediflicult to center the figure by means of the shaft 19. These pins 80are threaded at their outer ends and pro vided with nuts 81 to properlyadjust them.

It is obvious that the device may be modified and the parts otherwisearranged without departing from the essential features above described.

In Fig. 2 a pencil holder 83 is shown which may be adjusted by means ofa screw 84L so that it can be used as an ordinary beam compass andcircles drawn by the device.

What I claim as new and desire to secure by Letters Patent is, i

1. In an ellipsograph, the combination with a supporting frame, of arotating ring, a vertical shaft, a tilting disk on the shaft, means fortilting the disk and a shifting frame carried by the ring and adapted tooperate a pencil.

2. In an ellipsograph, the combination with a frame, of a rotating ringwithin the frame, a vertical shaft carried by the frame, a tilting diskon the shaft, means for tilting the disk, a shifting frame bearing onthe disk and carried by the ring, a slide on the ring, a pencil carrierin the slide and a lever connecting the shifting frame with the pencilslide.

3. In an ellipsograph, the combination with a circular frame having africtional lower surface, of a rotating ring in the frame, means forrotating the ring, a shaft carried by the frame, horizontal rodsjournaled on'the shaft and connected with the ring, a sliding frame onthe rods, a tilting disk on the shaft, adjusting screws adapted to tiltthe disk, a sliding pencil carrier and a lever connecting the slidingframe with the pencil carrier.

4. In an ellipsograph the combination with a circular frame having anupright, of a rubber base for the frame, a rotating ring in the upperside of the frame, gearing adapted to rotate the ring, a vertical shaftcarried by the upright, horizontal arms rotating about the shaft, atilting disk, blocks carrying the tilting disk, sleeves on the shaft andcarrying the blocks, adjusting screws playing in the blocks, a thumb nutoperating the adjusting screws, a shifting pencil carrier operating onguide-ways, a shifting frame carried by the rods and bearing against theedge of the disk, a lever connecting the shifting frame with the pencilcarrier, and a lever with a spring carried by one of the rods andbearing against the shifting frame.

In testimony whereof I afiix my signature in presence of two witnesses.

LOUIS BURKE.

WVitnesses:

JAMES F. DUHAMEL, CHARLES LA RUE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

